Polypropylene PP is one of the more widely used varieties of general-purpose plastics, with the advantages of low density, good rigidity, impact resistance, chemical corrosion resistance, easy processing and good insulation, has been widely used in the chemical industry, chemical fibers, construction, light industry, home appliances, automobiles and packaging and other industrial fields, is a very promising thermoplastic. Although polypropylene has good comprehensive performance, but the molding shrinkage rate is generally 1.5%-2.5%, compared with the molding shrinkage rate of 0.4%-0.6% of ABS is much larger, in the processing of precision parts are subject to great limitations.

Inorganic fillers such as talc powder, calcium carbonate, barium sulfate are often used as powder filling components in modified PP, especially in high filling, which can play a role in reducing costs. In addition, in addition to cost reduction, it can also give a certain type of plastic products with rigidity, heat resistance, dimensional stability, high gloss and other effects to play its functional role.